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Title: Self-assembly of a drop pattern from a two-dimensional grid of nanometric metallic filaments

We report experiments, modeling, and numerical simulations of the self–assembly of particle patterns obtained from a nanometric metallic square grid. Initially, nickel filaments of rectangular cross section are patterned on a SiO 2 flat surface, and then they are melted by laser irradiation with ~18-ns pulses. During this time, the liquefied metal dewets the substrate, leading to a linear array of drops along each side of the squares. The experimental data provide a series of SEM images of the resultant morphology as a function of the number of laser pulses or cumulative liquid lifetime. These data are analyzed in terms of fluid mechanical models that account for mass conservation and consider flow evolution with the aim to predict the final number of drops resulting from each side of the square. The aspect ratio, δ, between the square sides' lengths and their widths is an essential parameter of the problem. Our models allow us to predict the δ intervals within which a certain final number of drops are expected. The comparison with experimental data shows a good agreement with the model that explicitly considers the Stokes flow developed in the filaments neck region that lead to breakup points. Furthermore, numerical simulationsmore » that solve the Navier-Stokes equations along with slip boundary condition at the contact lines are implemented to describe the dynamics of the problem.« less
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ; ORCiD logo [3] ; ORCiD logo [3] ;  [4]
  1. Univ. Nacional del Centro de la Provincia de Buenos Aires and CIFICEN-CONICET-CICPBA, Tandil (Argentina)
  2. Utah State Univ., Logan, UT (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  4. New Jersey Institute of Technology, Newark, NJ (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 98; Journal Issue: 4; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING
OSTI Identifier:
1489592
Alternate Identifier(s):
OSTI ID: 1477529

Cuellar, Ingrith, Ravazzoli, Pablo D., Diez, Javier A., González, Alejandro G., Roberts, Nicholas A., Fowlkes, Jason Davidson, Rack, Philip D., and Kondic, Lou. Self-assembly of a drop pattern from a two-dimensional grid of nanometric metallic filaments. United States: N. p., Web. doi:10.1103/PhysRevE.98.043101.
Cuellar, Ingrith, Ravazzoli, Pablo D., Diez, Javier A., González, Alejandro G., Roberts, Nicholas A., Fowlkes, Jason Davidson, Rack, Philip D., & Kondic, Lou. Self-assembly of a drop pattern from a two-dimensional grid of nanometric metallic filaments. United States. doi:10.1103/PhysRevE.98.043101.
Cuellar, Ingrith, Ravazzoli, Pablo D., Diez, Javier A., González, Alejandro G., Roberts, Nicholas A., Fowlkes, Jason Davidson, Rack, Philip D., and Kondic, Lou. 2018. "Self-assembly of a drop pattern from a two-dimensional grid of nanometric metallic filaments". United States. doi:10.1103/PhysRevE.98.043101.
@article{osti_1489592,
title = {Self-assembly of a drop pattern from a two-dimensional grid of nanometric metallic filaments},
author = {Cuellar, Ingrith and Ravazzoli, Pablo D. and Diez, Javier A. and González, Alejandro G. and Roberts, Nicholas A. and Fowlkes, Jason Davidson and Rack, Philip D. and Kondic, Lou},
abstractNote = {We report experiments, modeling, and numerical simulations of the self–assembly of particle patterns obtained from a nanometric metallic square grid. Initially, nickel filaments of rectangular cross section are patterned on a SiO2 flat surface, and then they are melted by laser irradiation with ~18-ns pulses. During this time, the liquefied metal dewets the substrate, leading to a linear array of drops along each side of the squares. The experimental data provide a series of SEM images of the resultant morphology as a function of the number of laser pulses or cumulative liquid lifetime. These data are analyzed in terms of fluid mechanical models that account for mass conservation and consider flow evolution with the aim to predict the final number of drops resulting from each side of the square. The aspect ratio, δ, between the square sides' lengths and their widths is an essential parameter of the problem. Our models allow us to predict the δ intervals within which a certain final number of drops are expected. The comparison with experimental data shows a good agreement with the model that explicitly considers the Stokes flow developed in the filaments neck region that lead to breakup points. Furthermore, numerical simulations that solve the Navier-Stokes equations along with slip boundary condition at the contact lines are implemented to describe the dynamics of the problem.},
doi = {10.1103/PhysRevE.98.043101},
journal = {Physical Review E},
number = 4,
volume = 98,
place = {United States},
year = {2018},
month = {10}
}

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